Can opener



Nov. 11, 1969 I. JEPSON ET AL 3,477,263

CAN OPENER Original Filed Sept. 10, 1965 4 Sheets-Sheet l INVENTORS E I. JEPSON ET AL Nov. 11, 1969 CAN OPENER Original Filed Sept. 10, 1965 4 Sheets-Sheet 2 IN VE NTORS Nov. 11, 1969 I. JEPSON ETAL CAN OPENER 4 Sheets-Sheet 5 Original Filed Sept. 10, 1965 N v- 1 1969 1. JEPSON ET AL 3,477,263

CAN OPENER Original Filed Sept. 10, 1965 4 Sheets-Sheet 4 l gx United States Patent O ABSTRACT OF THE DISCLOSURE A method for opening cans utilizing a cutter which severs the cover from the can without the cutter entering into the food containing portion of the can.

This is a division of application Ser. No. 486,339, filed Sept. 10, 1965, now Patent No.3,'313,023 granted Apr. 11, 1967.

This invention relates generally to opening cans and more particularly to improvements in the method of opening cans in which method the can cutter does not 4 Claims 3,477,263 Patented Nov. 1 1 1969 Accordingly, it is an object of the present invention to provide an improved method for opening cans utilizing a cutter which severs the cover from the can without the cutter entering into the food containing portion of the can.

It is another object of the present invention to provide a new and improved can opening method in which the cover is removed from a can by severing the end .seam along the inside diameter thereof and bending the end seam outwardly.

A further object of the present invention is to provide an improved method of opening cans in which the end seam of the can is severed along the inner diameter thereof and bent outwardly to facilitate removal of the can cover.

Further objects and advantages of the present invention will become apparent as the following description proextend into the interior of the can during the cutting I operation.

In general, food containing cans are opened by means of can openers utilizing a cutting blade which is inserted through the'cover or wall of the can. The can is then rotated relative to the cutting blade to sever and remove the cover from the can. In that the cutter extends into the interior of the can, it invariably engages the contents of the can. As a consequence, the cutter becomes caked and encrusted with foods which remain thereon and tend to cause a very unsanitary condition.

This unsanitary condition of the can cuttermaybe minimized in a home through the use of easily removable cutters which may be washed at frequent intervals. In commercial situations including vending machines, the problem of maintaining the can cutter in a sanitary condition presents an insurmountable. problem with most present day can openers. It would be desirable, therefore, to provide a can opener in which the can cutter removes the cover of the can without piercing the container portion within which the food is received.

.There have been attempts in the past at opening cans without using a cutter which would pierce the can and extend into the food receiving portion. Some of these attempts have involved unrolling or unfolding the end seam of the can. In effect, this approach merely reverses the assembly process indisengaging the cover fromthe cylindrical side wall of the can. There are many problems associated with this approach, the principal one being that a substantial amount ofpower is required to break and unbend the cemented end seam of the can. In addition, the complexity of the folded flanges of the cover and side wall making up the end seam require a substantial amount of mechanism to complete the unfoldingo these flanges.

Attempts have also been made to design can openers in which the cover is severed from the can by cutting the end seam of the can. One of the problems inherent in this approach is that it is difficult to remove the cover even after a portion or all of the seam has been severed. If the cut is made on the outside diameter of the end seam, the cover still has a channel shaped peripher which is received on the end of the cylindrical wall portion. The cemented material associated with the end seam in addition to the frictional engagement of the parts retains the cut cover so firmly that it is usually impossible to remove by hand.

ceeds and the features of novelty which characterize this invention will be pointed out with particularity in the claims annexed to and forming a part of this specification.

For a better understanding of the present invention, reference may be had to the accompanying drawings in which:

FIG. 1 is a perspective view of an electric can opener for practicing the method of the present invention;

FIG. 2 is an enlarged fragmentary front elevational view of the can opener shown in FIG. 1;

FIG. 3 is a fragmentary sectional view taken on line 33 of FIG. 2;

FIG. 4 is a vertical section taken along line 4-4 of FIG. 2 assuming that FIG. 2 shows the complete structure and showing the operating lever in the position for loading a can into the device;

FIG. 5 is an enlarged fragmentary sectional view of a portion of FIG. 4 showing the operating lever in the operating or cutting position rather than in the can loading position as it is in FIG. 4;

FIG. 6 is a sectional view taken along line 6-6 of FIG. 4 assuming that FIG. 4 shows the complete structure;

'FIG. 7 is a sectional view taken along line 77 of FIG. 5 assuming that FIG. 5 shows the complete structure;

FIG. 8 is an enlarged fragmentary sectional view taken along line 88 of FIG. 6 assuming that FIG. 6 show the complete structure;

FIG. 9 is a greatly enlarged sectional view showing the relative positions of the can cutting wheel, the can driving wheel and the end seam of the can with the parts in the position for loading the can;

FIG. 10 is another greatly enlarged vertical sectional 7 view similar to FIG. 9 showing the action of the cutting wheel as it pierces the end seam of the can;

FIG. 11 is another greatly enlarged vertical sectional view similar to FIG. 9 and FIG. 10 showing the cutting wheel and the can driving wheel in their operative positions with respect to the end seam of the can as the cover is severed therefrom; and

FIG. 12 is a perspective view of the carrier which supports the can opener cutter.

The can opener disclosed herein for practicing the method of the instant invention is provided with a cutter wheel mounted for rotation about a vertical axis and movable horizontally into cutting engagement with the inside diameter of the end seam of a can. The cutter is provided with means to space its cutting edge slightly below the top of the end seam and to bend the end seam of the can outwardly to permit easy removal of the severed cover of the can.

Referring now to the drawings wherein like reference characters designate corresponding parts throughout the several views, there is shown a power operated can opener generally designated by reference numeral 20. The can opener 20 is provided with a housing 21 which is supported on a base 22. The housing 21 includes a motor enclosing portion 23 and a head portion 24 within which the reduction gearing and other mechanism of the can opener are received. Enclosed within the portion 23 of the housing 21 is a suitable electric motor 25 which may be the same as the one disclosed in copending Jepson application, Ser. No. 812,928, filed May 13, 1959, now Patent No. 3,097,318 and assigned to the same assignee as the instant application. The motor 25 includes a field 26 surrounding an armature 27.

The housing 21 is made up of a base member 28 which supports the motor 25 and a cover portion 29 which cooperates with the base portion 28 to form the enclosure within which the motor 25 and the can opener mechanism are received. As may best be seen in FIGURES 1 and 4, the cover portion 29 is a vertically extending box-like member having a rearwardly faced opening which is closed by the base member 28. The cover portion 29 serves primarily a decorative function and may, therefore, be made of a plastic material while base member 28 carn'es all the functional elements of the can opener and is preferably an aluminum casting. As is best shown in FIG. 4, the cover portion is assembled to the housing base 22 by means of vertically extending bolts 30 and the base member 28 is secured to the cover portion 29 by several screws 31, one of which is shown.

The armature 27 is supported by a vertically extending armature shaft 32 which is joumaled in bearings 33 mounted on the base member 28. The upper end of the armature shaft 32 is formed with a helical spur gear 34 which drivingly engages reduction gearing generally designated by reference numeral 35. The base member 28 has an integrally cast wall 28:: which supports the shafts associated with the reduction gearing 35.

At the output of the reduction gearing 35 there is a large output gear 36 which is secured to an output shaft 38. The output shaft 38 is journaled in an elongated boss 40 which is formed integrally with the wall 28a of the base member 28. At the lower end of the output shaft 38 there is mounted a can driving or rotating wheel 42. Positioned between the output gear 36 and the mounting boss 40 for the output shaft 38 are a series of conical washers 44 which are made of a spring material so as to be compressible and permit limited axial movement downwardly of the output shaft 38 and the can driving wheel 42 for reasons which will be explained in greater detail below.

Spaced closely adjacent the can driving wheel 42, there is mounted a can cutter or cutting wheel 46. To support the can cutting wheel 46 for horizontal movement toward and away from the can driving wheel 42, a slidable carrier 48 is mounted within the housing 21. The carrier 48, which is shown separately in FIG. 12, is a generally U-shaped member having horizontally extending legs 50 which are provided at their rearwardly extending free ends with rectangular openings 51. At the bight portion of the carrier 48 there is a horizontal cutter supporting portion 52. The cutter supporting portion 52 is formed with a taped hole 53 which threaded ly receives a cutter supporting screw 54 on which the cutter 46 is rotatably mounted.

As may best be seen in FIGURE 5, the wall 28a is provided with an opening 28b through which the supporting portion 52 of the carrier 48 extends thereby projecting the cutting wheel 46 downwardly from the head 24. The opening 28b is of sufiicient size to permit limited horizontal movement of tht carrier 48 with respect to the housing 21. The carrier 48 is supported with the legs 50 thereby slidably engaging the supporting Wall 28a. To guide the carrier for rectilinear movement on the wall 280, there are guide bosses 280 formed on either side thereof and an integral vertical flange 28d on the inside thereof as may best be seen in FIGURE 7. The bosses 28c also serve to support a guide plate 55 on the top thereof. Suitable assembly screws 56 retain the guide plate 55 in position. As is evident from FIGURE 6, the guide plate is of U-shaped configuration so as to retain the carrier 48 in position while being cut away in the center thereof for clearance in the area of the reduction gearing 35.

To control the operation of the can opener 20, there is provided a bail type or U-shaped operating handle 60 which is formed with a handle grip portion 62 at the bight thereof and supporting legs 64. The free ends of the legs 64 are formed with inwardly directed bosses 66 which journal the operating lever 60 for rotation with respect to the can opener 20. While the mounting bosses 66 are supported for rotary movement by the base member 28 and more specifically, the supporting wall 28a, means are included in the mounting to permit limited horizontal movement of the operating handle pivot for reason which will be explained in greater detail below.

As may best be seen in enlarged fragmentary section view in FIGURE 8, the wall 28a is formed with two pockets 28:: within which the mounting bosses 66, biasing springs 68, and a force-supplying pad are received. Each spring 68 engages the front part of a pocket 28c urging pad 70 rearwardly into engagement with mounting boss 66. Pad 70 is provided with a cylindrical projection 70a which extends into the helix of the spring 68 to assure proper engagement between the spring 68 and the pad 70. The face of pad 70 which engages boss 66 is provided with a cylindrical surface having a web 70b projecting therefrom.

Web 70b is received between two spaced cylindrical portions 66a formed on each mounting boss 66. The purpose of web 70b is to locate and present axial displacement of pad 70 with respect to handle mounting bosses 66. To prevent displacement of the handle or lever 60 with respect to the base member 28 on which it is mounted, there is provided in each of the pockets 282 a small upstanding projection 28 which is positioned below each mounting boss 66 and between the cylindrical portions 66a.

To interconnect the operating lever 60 with the carrier 48, the bosses '66 of the operating lever 60 are provided with eccentrically positioned inwardly directed pins 72.

The pins 72 comprise steel rods which are cast integrally with the aluminum operating lever 60. Because of the amount of eccentricity in the mounting of the pins 72, they are exposed in the area between the cylindrical portions 66a on the mounting bosses 66. The degree of exposure of pin 72 in the area between the cylindrical portions 66a is evident from FIGURE 8 which is a sectional view taken through boss 66 of the operating lever 60. It was mentioned above that projection 28f between the cylindrical portions 66a serves to prevent axial displacement of mounting boss 66. The projection 28 also serves as a stop to limit rotation of the operating handle 60 in its vertical position as is best shown in FIGURE 8.

Before turning to the details of the connection between the operating handle 60 and the carrier 48, it should be noted that the pocket 282 within which the handle mounting bosses 66 are received, is a channel shaped recess closed at the top by the guide plate 55 and at its inner side by the leg 50 of the carrier 48 with the opening 51 exposed thereto. Received within the opening 51 and positioned between the end of the mounting boss 66 and the vertical wall flange 280! is a sintered iron bearing slide 74. The bearing slide 74 is formed with a centrally positioned hole 75 which receives the eccentric pin 72. As the operating handle 60 is rotated from its vertical position forwardly and downwardly about the mounting bosses 66, the eccentric pins 72 are moved rearwardly and upwardly. Each bearing slide 74 is provided with ample clearance in rectangular opening 51 to move vertically while the operating handle moves through its range of movement. The rearward movement of the pins 72, however, cause the carrier 48 to be drawn rearwardly,

thereby moving the cutting wheel 46 into overlapping relation with the can driving wheel 42.

The U-shaped handle 60 with its mounting at the rear of the housing 21 provides a very convenient, compact and efiicient arrangement for operating the carrier and its associated cutting wheel 46. Because of the substantial force which must be exerted on the carrier and cutting wheel 46, a lever arm of reasonable length is required to maintain the force to be applied at the grip 62 at a reasonable level. The bail type handle mounted at the rear provides a lever of reasonable length without sacrificing compactness. With the gripping portion 62 close to the head, force may easily 'be applied to the handle 60 without unbalanc'ing the can opener 20.

Reference will now be made to FIGURES 9, and 11 to describe the configuration of the driving wheel 42 and the cutting wheel 46 and the manner in'which they cooperate to sever the lid of the can. FIGURES 9, l0 and 11 in addition to showing the driving wheel 42 and cutting wheel 46, portray a sectional viewof a portion of can 76. The can 76 includes a cylindrical side wall 77 and a circular top 78. To unite the cylindrical side wall 77 with the top 78, a plurality of interleaving vertical flanges are formed and cemented to provide a liquid tight seam between the two parts of the can as shown in FIGURE 9. This junction between the two parts of the can is commonly known as the end seam. As has been indicated above, the can opener 20 operates on the end scam in opening the can rather than piercing the .body portion of the can within which the food is contained.

The can driving wheel 42 is generally cylindrical in configuration, having an outer diameter 42a against which the side of the can 77 abuts. Immediately above the portion 42a there is an upwardly facing annular shoulder 42b which supports the can against vertical displacement by engaging the bottom of the overhanging portion of the can end seam. Adjacent the shoulder 42b, the driving wheel 42 is formed with a serrated driving surface 420. This serrated driving surface is made up of radially extending spaced triangular projections which extend outward- 1y from a conical surface. The pointed ends of the projections are intended to sink into the can end seam as it is forced against the driving wheel 42 by the cutting wheel 46.

The cutting wheel 46 is generally cylindrical and mounted for rotation on the mounting screw 54 as was explained above. Spaced upwardly from the bottom of the cutting wheel 46 is a circular cutting edge 46a. The cutting edge 46a is formed by two intersecting surfaces, a conical surface 46b extending outwardly and downwardly toward the edge 46a and a'substantially flat but slightly conical surface 460 which extends outwardly and upwardly toward the cutting edge 46a. As may readily be seen in FIGURE 9, the conical surfaces 46b and 46e intersect at the cutting edge 46a, defining an acute cutting edge having an enclosed angle of slightly less than 80. Spaced below the cutting edge and above the bottom of the cutting wheel 46 there is an inverted conical bending surface 46d, FIGURE 10 illustrates how the cutting edge 46a engages the innermost flangeof the end seam thereby severing it at the upper edge of the cylindrical wall 77. Up until that point in the process, the bending surface 46d is ineffective. In FIGURE 11, however, it is shown how the inclined or conical bending surface 46d engages the end seam of the can bending it outwardly, this outward bend giving the abutting portions of the cover and the can a conical configuration. Without this outward inclination of the abutting vertical flanges on the cover 78 and the can wall 77, it would be difiicult, if not impossible, to remove the severed cover from the can.

Extending outwardly from the conical surface 46b is a spacing shoulder 462 which engages the top of the end seam of the can and locates the cutting edge 46a precisely with respect to the layers of material in the end seam. To achieve the optimum performance, it is necessary that the cutting edge 46a sever only a single layer of material in the end seam and displace the portion of the seam still assembled to the can side wall 77 a suflicient amount that the cover 78 may be readily removed therefrom. It has been determined that this objective may best be achieved by severing the outer layer of the end seam above the top edge of the cylindrical side wall 77. Thus, as is shown in FIGURE 10, the cutter should move across the upper folded edge of the side wall 77 carrying with it the outer layer of material as it makes the cut.

While the thickness of the can material varies between .007" and .012, it has been found that the cutting edge 46a may be spaced vertically from the shoulder 46e a distance of from .015" to .017" for a satisfactory severance of the outer layer of the end seam with no penetration of the top of the cylindrical wall 77. Apparently the cutting edge 46a can slide slightly along the radius edge of wall 77 without digging in.

Inasmuch as the height of the end seam from the overhanging portion which rests against the shoulder 42b to the top thereof varies considerably, means must be provided to compensate for this variation and assure tight engagement of both the driving wheel 42 and the cutting wheel 46 against the end seam. The cutting wheel 46 is mounted for horizontal movement but is fixed against movement in a vertical direction. It has been mentioned above, however, that the driving wheel 42 is provided with spring washers 44 which permit it to be moved downwardly a limited amount. Inasmuch as the can end seam is initially positioned on the shoulder 42b of the driving wheel, means must be provided to depress the driving wheel the necessary amount as the cutting wheel is moved horizontally toward the driving wheel. This depression of the driving wheel 42 is accomplished by means of a conical camming surface 46 which extends outwardly and upwardly from the aforementioned spacing surface 46e. As the cutting wheel 46 moves toward the driving wheel 42, the top of the end seam will engage the camming surface 46 which biases the end seam and the driving wheel downwardly, thereby compressing the spring washers 44. The cutting wheel 46 ultimately slides over the end seam until the horizontal spacing surface 462 is in engagement with the top of the end seam. This engage ment determines the extent of the depression of the driving wheel 42 and assures a tight clamping of the seam between the driving wheel shoulder 42b and the cutting wheel shoulder or surface 46e.

As was mentioned above, there is almost .005" difference in thickness between can materials. Inasmuch as the end seam of a can includes five thicknesses of material, the total possible difference in thickness in the entire end seam is .025. While this difference in thickness is accommodated to some extent by a mere variation in the depth of penetration of the serrated surface 420 into the end seam, the springs 68 received in the pockets 28e of the base 28 permit variation in the position of the handle mounting bosses 6'6 and of the carrier 48 to accommodate thicker end seams.

As the operating handle 60 is moved from the vertical position shown in FIGURE 4 to the horizontal position with the motor 25, a switch control lever 84 is pivotally mounted within the head 24 with an outer end 86 extending outside of the housing 21. The exposed end 86 of the switch control lever 84 is positioned in the same horizontal plane as the pivot for the operating lever 60 and positioned to be engaged by the gripping portion of the operating lever 60 when it is moved to the can cutting position. As is shown in FIGURE 5, the gripping portion 62 engages the exposed end 86, forcing it downwardly, and moving the inner end of the lever 84, upwardly to actuate the swtich 80. In this manner, the motor 25 is energized to rotate the driving wheel 42 at the same time the cutting wheel has moved into the proper cutting position with respect to the end seam of the can, as is shown in FIGURE 11.

To assure that the can is properly positioned when placed in the can opener 20 for opening, a guide bar 88 is provided on the front side of the motor enclosing portion 23 of the housing 21. When the end seam of the can is placed on the upwardly facing annular shoulder 42b with the side wall of the can against the guide bar 88, the can should be at the proper height and reasonably well aligned. To give additional assurance as to proper alignment, a guide rib 90 is provided which extends downwardly on the overhanging portion of the head 24. The rib 90 extends completely around the cutting wheel 46 which projects only slightly below the lower edge thereof.

In loading a can, the operator moves the end seam into engagement with the guide rib 90 and then downwardly against the annular shoulder 42b on the driving wheel. During rotation of the can, any tendency to twist from vertical orientation of the can axis will be resisted by the guide rib 90. At the middle of the guide rib 90 adjacent the cutting wheel 46, a projection 91 is mounted thereon to provide increased stability to a can during the opening thereof. The projection 91 extends slightly below the rib 90 since it is intended to engage the top of the can while the rib 90 is intended to engage the end seam.

Immediately behind the can driving wheel 42 there is a clearance 29a in the cover portion 29 of the housing. The clearance opening 29a is necessary so that the base member 28 with the motor 25, reduction gearing 35, the can driving wheel 42 and cutting wheel 46 may be inserted into the cover portion 29 from the rear. To cover the opening 29a and complete the assembly of the cover 29 to the base member 28, an L-shaped closure plate 92 is secured to the bearing support wall 28a as best shown in FIGURE 4. The vertically extending portion of the closure plate 92 extends behind the opening 29a and abuts the portion of the cover 29 surrounding the opening. Additional assembly screws 93 extend through the portion of the cover 29 adjacent to the opening 29a into the plate 92 to assure a rigid assembly of the two housing portions 28 and 29. The closure plate 92 is slotted to receive the inner ends of the guide rib 90. The forwardly extending portion of the guide rib 90 is retained in place by a pair of vertically extending bolts 94 which extend upwardly through the bearing support wall 28a and the guide plate 55 to retain all these parts in assembled relation.

There are various considerations involved in determining the extent of the outward bend which should be given the end seam of the can. In the embodiment of the cutter shown in FIGURES 9 through 11 the conical bearing surface 46d slopes at an angle of 30 with respect to the axis of the cutter 46. Such a slope produces approximately a 30 outward bend in the end seam of the cam. The necessary amount of outward bend to cause the cover flange to release itself or to break away from the side wall 77 of the can is dependent on the coeflicient of friction between these two surfaces. In analyzing the forces acting on the can cover, it is helpful to compare the can structure after the end seam has been bent outwardly to a wedge tightly received in a piece of material. The can wall retains the cover in much the same manner as the material retains a wedge. The formula for expressing the self-releasing condition for wedges is well known in the field of mechanics and may be applied to illustrate the considerations involved in bending the can end seam.

. In the wedge situation, it has been found that if the tangent of the angle of each wedge face to the central axis is equal to the coefficient of friction between the wedge and the material into which it is driven, the wedge will be self-releasing. Similarly, when the end seam of the can is bent outwardly to such an extent that the tangent of the angle of bend is equal to the coeflicient of friction between the cover and the can wall, the cover will be released from the can. The angle between the frictionally engaging face of the wedge and the axis of the wedge is termed the angle of friction. The similar angle of thecan analogy is the angle through which the end seam has been bent; this angle may also be recited in the claims as the friction angle. Using the handbook value of the coefficient of friction for mild steel against mild steel or .57, we arrive at a bend angle of 30. Actually the tangent of the friction angle should slightly exceed the coefficient of friction if the cover of the can is to be urged upwardly. Many different materials are used in the manufacture of cans and many types of cements are employed in sealing the end seams. While all these factors tend to vary the coefficient of friction, it has been found that satisfactory cover release of all cans opened during tests was obtained using the 30 angle referred to above.

As the terms vertical and horizontal and their equivalents are used in both specifications and the claims, it should be understood that they are used only to provide relative orientation of the parts and not intended as limitations as to the position of use of the apparatus. These terms have been used since cans are generally open at the top in a vertical position to prevent spillage of their contents. In instances where such spillage does not present a problem, it is contemplated that the apparatus disclosed herein could be oriented in any desired position. The term cutting means as used in the claims is intended to include both the cutting wheel and the can driving wheel as described in the specifications.

While there has been illustrated and described a single preferred embodiment of a can opener for performing the method of the invention, it will be readily understood by those skilled in the art that numerous changes and modifications can be made in the can opener for practicing the method without departing from the present invention. It is aimed in the appended claims to cover all such changes and modifications as fall within the true spirit and scope of the present invention. It is contemplated, for instance, that the cutting and bending disclosed in FIGURES 10 and 11 of the drawings could be accomplished at separate stations in a machine. It is also contemplated that after severing the end seamv on the inner diameter, the bending of the seam outwardly to facilitate removal of the can cover could be accomplished by hand. Applicants invention, therefore, encompasses the method for opening cans through the severence of the end seam on the inside diameter above the top of the side wall of the can and bending the end seam outwardly to facilitate removal of the cover.

What is claimed as new and desired to be secured by Letters Patent of the United States is:

1. The method of opening a can of the type having a rolled end seam in which the periphery of the can cover has an upwardly directed vertical flange joined to an outwardly spaced downwardly turned flange with the two aforementioned flanges sandwiching the end of the cylindrical can wall comprising, piercing the upwardly directed flange with a cutting means, rotating said can in continuous engagement with said cutting means, bending the upper edge of said end seam outwardly whereby said vertical flange and end seam are inclined outwardly with respect to the axis of said can, and lifting said cover from engagement with the end of said cylindrical can wall, said end seam is bent outwardly to an extent to at least exceed the frictional angle for the engaging surfaces on the cover and the end seam.

2. The method of opening a can of the type having a rolled end scam in which the periphery of the can cover has an upwardly directed vertical flange joined to an outwardly spaced downwardly turned flange with the two aforementioned flange sandwiching the end of the cylindrical can wall comprising, piercing the upwardly directed flange with a cutting means, rotating said can in continuous engagement with said cutting means, bending the upper edge of said end seam outwardly whereby said vertical flange and end seam are inclined outwardly with respect to the axis of said can, and lifting said cover from engagement with the end of said cylindrical can wall, said end seam is bent outwardly to an angle of approximately 30 to the axis of the can.

3. The method of opening a can of the type having a rolled end seam in which the periphery of the can cover has an upwardly directed vertical flange joined to an outwardly spaced downwardly turned flange with the two aforementioned flange sandwiching the end of the cylindrical can wall comprising piercing said upwardly directed flange at a point above the end of the cylindrical can wall with a cutting means, rotating said can in continuous engagement with said cutting means and bending the top of said end seam outwardly whereby said vertical flange and end seam are inclined outwardly with respect to the axis of said can to permit easy removal of said can lid from said can, said cover is cut from said can with an upwardly extending cylindrical flange on the periphery of said cover, and said flange and said end seam are bent outwardly sufficiently to release said flange from said end seam.

4. The method of claim 3 wherein said flange and and seam are bent outwardly to an angle of approximately 30 to the axis of the can thereby forming a conical flange on the cover.

References Cited UNITED STATES PATENTS 2,196,182 4/1940 Arnesen 7271 CHARLES W. LANHAM, Primary Examiner B. T. MUSTAIKIS, Assistant Examiner US. Cl. X.R. 72324 

